Omigawa was a town located in Katori District, Chiba Prefecture, Japan. Omigawa has been settled since prehistoric times, with numerous shell middens and burial mounds from the Japanese Paleolithic through Kofun period. During the Edo period, it was the center of Omigawa Domain, a feudal domain of the Tokugawa shogunate. Modern Omigawa Town was created in the early Meiji period.